package com.lagou.rpc.provider.server;

import com.lagou.rpc.provider.handler.RpcServerHandler;
import io.netty.bootstrap.Bootstrap;
import io.netty.bootstrap.ServerBootstrap;
import io.netty.channel.ChannelFuture;
import io.netty.channel.ChannelHandler;
import io.netty.channel.ChannelInitializer;
import io.netty.channel.ChannelPipeline;
import io.netty.channel.nio.NioEventLoopGroup;
import io.netty.channel.socket.SocketChannel;
import io.netty.channel.socket.nio.NioServerSocketChannel;
import io.netty.handler.codec.string.StringDecoder;
import io.netty.handler.codec.string.StringEncoder;
import org.springframework.beans.factory.DisposableBean;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

/**
 * 服务启动类
 */
@Service
public class RpcServer implements DisposableBean{

    private NioEventLoopGroup bossGroup;

    private NioEventLoopGroup workerGroup;

    @Autowired
    private RpcServerHandler rpcServerHandler;


    public void startServer(String ip, int port){

        try {
            //1.创建线程组
            bossGroup = new NioEventLoopGroup(1);
            workerGroup = new NioEventLoopGroup();

            //2.创建服务端启动助手
            ServerBootstrap serverBootstrap = new ServerBootstrap();

            //3.设置参数
            serverBootstrap.group(bossGroup,workerGroup)
                    .channel(NioServerSocketChannel.class)
                    .childHandler(new ChannelInitializer<SocketChannel>() {
                        @Override
                        protected void initChannel(SocketChannel socketChannel) throws Exception {
                            ChannelPipeline pipeline = socketChannel.pipeline();

                            //添加String的编解码器
                            pipeline.addLast(new StringDecoder());
                            pipeline.addLast(new StringEncoder());

                            //业务处理器
                            pipeline.addLast(rpcServerHandler);
                        }
                    });
            //4.绑定端口
            ChannelFuture channelFuture = serverBootstrap.bind(ip, port).sync();
            System.out.println("-----服务器【"+ip+":"+port+"】启动成功-----");
            //关闭
            channelFuture.channel().closeFuture().sync();

            System.out.println("-----服务器【"+ip+":"+port+"】关闭-----");
        } catch (InterruptedException e) {
            e.printStackTrace();
            if(bossGroup != null){
                bossGroup.shutdownGracefully();
            }

            if(workerGroup != null){
                workerGroup.shutdownGracefully();
            }
        }
    }



    @Override
    public void destroy() throws Exception {
        if(bossGroup != null){
            bossGroup.shutdownGracefully();
        }

        if(workerGroup != null){
            workerGroup.shutdownGracefully();
        }
    }
}
